Was it during the summer vacation ______ he went to Shanghai?
I ______ along the street looking for a place to park when the accident ____________.
—Do you have anything to say for yourselves? —Yes,there's one point ______ we must insist on.
Having been praised by the teacher,the little girl ran back home,______.
Despite their______ of interest,Fleming kept trying to develop the chemical ______ it would be safe and effective.
Helen always helps her mother even though going to school ______ most of her day.